CBE Final questions with 100% correct answers 2024

CBE Final The heat conduction equation in a medium is given in the simplest form as: ∂^2T ∂^2T =0 ∂x^2 + ∂y^2 where the parameters have their usual meaning. Which of the following statements is incorrect - correct answer Thermal conductivity is negligible If force, length, and time are selected as the three fundamental dimensions, the units of viscosity in the SI system could be written as - correct answer kg/m*s The thermal conductivity of a substance may be defined as the rate of heat transfer per unit length per unit temperature difference. The primary dimensions of thermal conductivity in the M-L-T-theta-are: - correct answer ML/(T^3)Theta A fluid flows through a truncated conical pipe at steady-state and constant density. The radius at the outlet is half the radius of the inlet. The velocity of the fluid exiting is ___________ the velocity of the fluid entering. - correct answer 4 times greater Which of the following are correct units for heat transfer coefficient? - correct answer kg/(s^3)(K) In a counter-flow heat exchanger, 2 kg/s of hot water flows through the tubes and 8 kg/s of cold water flows on the shell side. Which flow will experience the lowest temperature change? - correct answer Cold Water Water flows through a tube of length L with a mean inlet temperature (Ti). The tube is held at a uniform surface temperature (Ts) greater than Ti. Which temperature profile best represents the mean temperature of the water as if flows through the tube? - correct answer increases sharply then plateus A Newtonian fluid flows under steady, laminar conditions through a circular pipe of diameter